<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>例子</title>
    <style>
        body {
            
        }
        div {
            margin: 50px;
            height: 200px;
            background-color: aquamarine;
            overflow: hidden;
        }
        section {
            overflow: hidden;
        }

    </style>
</head>
<body>
    <div>1</div>
    <section>
        <div>2</div>
    </section>

</body>
</html>